Sisemore quickly assembled a team to assist with the complex project. The 2-mile-long pipeline that crosses the runway and taxiway needed preservation during the recent runway reconstruction. Submerged lakes plates cool water, which makes a continuous loop to and from a terminal’s central utility plant. We knew going in that we would need a solid structural plan for runway replacement.”Įarlier, BNA had also converted the remaining rock quarry lake, which sits next to the runway, into a vast geothermal cooling system. “They had to fix the runway a couple times to lift it up. “With deep fill, there’s always slow settlement that occurs,” Sisemore explains. The fill had slowly settled over the years, requiring crews to pressure grout and replace entire concrete slabs to restore the runway’s profile. Garver had previously completed dozens of projects at BNA, but Sisemore was particularly drawn to this one because the original runway was built on a former rock quarry-a 350-foot-deep depression that had required substantial fill. “It was an interesting job, and a huge opportunity for sustainable construction,” he explains. When the airport issued a request for qualifications, Sisemore knew he wanted to win the work. “The poor rating didn’t mean the runway was unsafe,” Holton specifies, “but it showed it was time for reconstruction.” It had received multiple rehabs and isolated repairs throughout the years, but complete replacement became the only option when its Pavement Condition Index (PCI) dropped from 70 to 54. Runway 2R-20L was constructed in 1989 and reached the end of its useful life in 2018. Instead, it’s in a stockpile to use in future projects, saving future dollars.”Īccording to Sisemore, the price for virgin crushed aggregate base averages $45 a ton, but the airport’s cost for recycled concrete aggregate came in at $13.50 a ton. Before, we would have hauled the material away for disposal. “We went from looking at concrete removal as a liability, to viewing it as an asset. Ryan Sisemore, vice president for Garver, stresses that the 50,000 cubic yards of processed material left over from the runway project will save BNA money in the future. Personnel from Garver, the engineering, planning, architectural and environmental services firm that lead the project, are similarly enthusiastic about the recycling method. The savings are pretty significant any time you can use materials in place.” “But using off-site materials can be up to four times the cost. “It’s hard to put a hard number on total savings, because we saved some recycled concrete for other projects,” says Holton. Material not needed for the new runway was saved for other projects in the airport’s $1.6 billion Vision program. “For this project, we recycled all of the concrete.”Īntigo Construction broke up the existing 15-inch pavement on Runway 2R-20L and rubblized it to use during reconstruction. We try to be as sustainable as we can on every project,” says Traci Holton, BNA vice president, chief engineer and deputy chief operating officer. “Sustainability is a key initiative for the airport. Here, the airport shaved an estimated $6.4 million off construction costs by using recycled concrete aggregate for the base of its 8,000-foot main runway. Most recently, BNA received an Honor Award in the ACEC Engineering Excellence Award competition for the sustainability and unique engineering of its Runway 2R-20L reconstruction project. Recycling concrete into aggregate base on site shaved up to 11% of project cost & supported airport’s sustainability goals Of Note: Runway was originally constructed over quarry with deep fill, which made settlement a concern. Geotechnical Investigations/Environmental: Wood Environment & Infrastructure SolutionsĮarthwork and Drainage: Eutaw ConstructionĮlectrical, Lighting & Signage: BBH Electric Topographical Survey: Civil Infrastructure Associates Geometric, Grading & Drainage Design: Atkins North AmericaĮrosion/Sediment Control Plans, Stormwater Pollution, Airfield Markings: Shrewsberry Owner: Metropolitan Nashville Airport Authority Metropolitan Nashville Airport Authority received the honor for its efforts to promote water conservation, energy efficiency, social well-being and community involvement. In 2017, the Water Source Geothermal project at BNA netted an Envision Silver award from the Institute for Sustainable Infrastructure. It is one of just nine airport facilities in the world to earn LEED Silver under the U.S. When the Music City airport opened Concourse D in 2020, the project achieved LEED Silver certification for a sustainable, wellness-oriented design and construction process. Some say it isn’t easy being green, but Nashville International Airport (BNA) certainly makes it look effortless.
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